Journal Article

Iron line profiles in <i>Suzaku</i> spectra of bare Seyfert galaxies

A. R. Patrick, J. N. Reeves, D. Porquet, A. G. Markowitz, A. P. Lobban and Y. Terashima

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 411, issue 4, pages 2353-2370
Published in print March 2011 | ISSN: 0035-8711
Published online March 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.17852.x
Iron line profiles in Suzaku spectra of bare Seyfert galaxies

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We methodically model the broad-band Suzaku spectra of a small sample of six ‘bare’ Seyfert galaxies: Ark 120, Fairall 9, MCG −02-14-009, Mrk 335, NGC 7469 and SWIFT J2127.4+5654. The analysis of bare Seyferts allows a consistent and physical modelling of active galactic nuclei due to a weak amount of any intrinsic warm absorption, removing the degeneracy between the spectral curvature due to warm absorption and the red wing of the Fe K region. Through effective modelling of the broad-band spectrum and investigating the presence of narrow neutral or ionized emission lines and reflection from distant material, we obtain an accurate and detailed description of the Fe K line region using models such as laor, kerrdisk and kerrconv.

Results suggest that ionized emission lines at 6.7 and 6.97 keV (particularly Fe xxvi) are relatively common, and the inclusion of these lines can greatly affect the parameters obtained with relativistic models, i.e. spin, emissivity, inner radius of emission and inclination. Moderately broad components are found in all objects, but typically the emission originates from tens of rg, rather than within <6 rg of the black hole. Results obtained with kerrdisk line profiles suggest an average emissivity of q ∼ 2.3 at intermediate spin values with all objects ruling out the presence of a maximally spinning black hole at the 90 per cent confidence level. We also present new spin constraints for Mrk 335 and NGC 7469 with intermediate values of a= 0.70+0.12−0.01 and 0.69+0.09−0.09, respectively.

Keywords: black hole physics; galaxies: active; galaxies: Seyfert; X-rays: galaxies

Journal Article.  11271 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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